private void logoutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            uc.User = null;
            Form frm = this.ActiveMdiChild;
            MessageBox.Show("Logout success !");
            tsslUser.Text = "No Login";
            loginToolStripMenuItem.Enabled = true;
            logoutToolStripMenuItem.Enabled = false;            
            //atteKindtoolStripMenuItem.Enabled = false;
            //wageToolStripMenuItem.Enabled = false;
            Control[] ca = frm.Controls.Find("bindingNavigator1", true);
            if (ca.Length > 0)
            {
                ca[0].Enabled = false;
            }
            ca = frm.Controls.Find("dataGridView1", true);
            if (ca.Length > 0)
            {
                ((DataGridView)ca[0]).ReadOnly = true;
            }
            ca = frm.Controls.Find("btnSet", true);
            if (ca.Length > 0)
            {
                ca[0].Enabled = false;
            }
        }
